package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;
    //微信服务接口地址
    public static  final  String WX_LOGIN  = "https://api.weixin.qq.com/sns/jscode2session";
    /*
    * 微信登录
    * */
    @Override
    public User weixinlogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获得openid
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空，为空登录失败。抛出业务异常

        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //不为空，合法的用户。判断是否是外卖系统的新用户，是则自动完成注册
        User user = userMapper.getByOpenId(openid);
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //返回用户对象
        return user;
    }

    private String getOpenid(String code){

        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        //从微信传出来的为json类型的数据
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        //解析数据
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
